(CNN) —  

The 64-year-old woman who died last weekend on a Royal Caribbean cruise ship had heart disease, the FBI said Thursday.

Katherine Kennedy was found by her husband in their cabin Sunday, Royal Caribbean said.

The couple was traveling on the Enchantment of the Seas, which was on a seven-day voyage from Baltimore to Florida and the Bahamas.

On Thursday, the FBI said the medical examiner found a cut on Kennedy’s head, which likely occurred when she fell.